468 
NORTH AMERICAN PLECOPTERA 
female specimen with the label “Rheinwalcl” (W. Bennett 
eollector). On account of this apparent discrepancy in locality 
I am neither accepting Perlodes transversa as an American species, 
nor including Perlodes in this tribe, since I hav^e not found any 
representatives of it among our material. 
PROTARCYS Klapdlek 
1912. Protarcys Ivlapdlek, Coll. Selys, 4: 8. 
“Wings surprisingly short and broad, especially the hind ones. 
Cross-veins numerous, only lacking in field Mi” — translation 
from Klapdlek’s description of the genus. The lack of cross-veins 
in field Mi is not constant in this genus. Klapdlek mentions 
their presence in one of his specific descriptions, Protarcys caudata 
Kip., p. 9. I am, therefore, placing here two American species 
which have a rich network of cross-veins extending from costa 
to the second branch of cubitus including field Mi. The wings 
are not surprisingly short and broad, but the similarity between 
the genitalia of the male which Klapdlek describes and figures, 
and that of the male I am placing here is so striking that it seems 
to indicate close kinship. 
The American species have additional venational characters; 
the costal margin does not show a slight concavity at the humeral 
cross-vein, practically the entire costal area beyond the humeral 
cross-vein is occupied by numerous cross-veins, subcosta runs 
into radius beyond the level of the cord, the length of the inner 
inter-radial cell is about a fourth greater than its base, the cord® 
(“anastomosis” of Banks and Klapdlek) is well developed. The 
ninth sternite forms a short, subgenital plate; the tenth tergite 
is cleft, each lobe being produced into a short, stout projection 
directed inward and upward; in the species which we have the 
para-genital plates are the only parts of the supra-anal plate 
which are visible without dissecting. Both of the American 
species bear gills. 
* The fullest discussion of this feature of insect venation is to be found on 
page 223 of Prof. J. G. Needham’s “Report of the Entomological Field Station 
conducted at Old Forge, N. Y. in the Summer of 1905” — New York State 
Museum Bulletin 124. 
